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(C++) QTableViewExample9

 

QtQt CreatorLubuntu

 

QTableView example 9: two tables with checkboxes and editable text using a custom model is a QTableView example.

 

Technical facts

 

Application type(s)

Operating system(s) or programming environment(s)

IDE(s):

Project type:

C++ standard:

Compiler(s):

Libraries used:

 

 

 

 

 

Qt project file: ./CppQTableViewExample9/CppQTableViewExample9.pro

 

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TEMPLATE = app
QMAKE_CXXFLAGS += -std=c++11
SOURCES += \
    qtdialog.cpp \
    qtmain.cpp \
    mymodel.cpp

HEADERS  += qtdialog.h \
    mymodel.h

FORMS    += qtdialog.ui

 

 

 

 

 

./CppQTableViewExample9/mymodel.h

 

#ifndef MYMODEL_H
#define MYMODEL_H

//#include <QAbstractTableModel>
#include <QStandardItemModel>

struct MyModel : public QStandardItemModel
{
public:
  MyModel(QObject *parent = 0);
  void AddRow();

private:
};

#endif // MYMODEL_H

 

 

 

 

 

./CppQTableViewExample9/mymodel.cpp

 

#include "mymodel.h"

#include <cassert>

MyModel::MyModel(QObject *parent)
  : QStandardItemModel(parent)
{
  setColumnCount(3);
  setHeaderData(0,Qt::Horizontal,"Y");
  setHeaderData(1,Qt::Horizontal,"N");
  setHeaderData(2,Qt::Horizontal,"Question");
  for (int i=0; i!=5; ++i) AddRow();
}

void MyModel::AddRow()
{
  QList<QStandardItem*> items;
  //Add 'yes' checkbox
  {
    QStandardItem * const item = new QStandardItem;
    item->setCheckable(true);
    item->setEditable(false);
    item->setCheckState(Qt::Unchecked);
    items.push_back(item);
  }
  //Add 'no' checkbox
  {
    QStandardItem * const item = new QStandardItem;
    item->setCheckable(true);
    item->setEditable(false);
    item->setCheckState(Qt::Unchecked);
    items.push_back(item);
  }
  //Add 'yes' checkbox
  {
    QStandardItem * const item = new QStandardItem;
    item->setEditable(true);
    item->setText("Is this a useful question?");
    items.push_back(item);
  }

  assert(columnCount() == items.size());
  appendRow(items);
  emit layoutChanged();
}

 

 

 

 

 

./CppQTableViewExample9/qtdialog.h

 

#ifndef QTDIALOG_H
#define QTDIALOG_H

#include <QDialog>

namespace Ui {
  class QtDialog;
}

struct QStandardItemModel;

class QtDialog : public QDialog
{
  Q_OBJECT
  
public:
  explicit QtDialog(QWidget *parent = 0);
  ~QtDialog();
  
private slots:
  void on_button_clicked();

private:
  Ui::QtDialog *ui;
};

#endif // QTDIALOG_H

 

 

 

 

 

./CppQTableViewExample9/qtdialog.cpp

 

#include "qtdialog.h"

#include <cassert>

#include "mymodel.h"
#include "ui_qtdialog.h"

QtDialog::QtDialog(QWidget *parent) :
  QDialog(parent),
  ui(new Ui::QtDialog)
{
  ui->setupUi(this);

  MyModel * const model = new MyModel(this);
  assert(!ui->table_1->model());
  assert(!ui->table_2->model());
  ui->table_1->setModel(model);
  ui->table_2->setModel(model);
  assert(ui->table_1->model());
  assert(ui->table_2->model());


  ui->table_1->setColumnWidth(0, 24);
  ui->table_2->setColumnWidth(0, 24);
  ui->table_1->setColumnWidth(1, 24);
  ui->table_2->setColumnWidth(1, 24);
  ui->table_1->setColumnWidth(2,175);
  ui->table_2->setColumnWidth(2,175);
}

QtDialog::~QtDialog()
{
  delete ui;
}

void QtDialog::on_button_clicked()
{
  QTableView * const view = ui->table_1->hasFocus() ? ui->table_1 : ui->table_2;
  dynamic_cast<MyModel*>(view->model())->AddRow(); //Other view will synchronize
  view->scrollToBottom();
  const int n_rows = view->model()->rowCount();
  view->setCurrentIndex(view->model()->index(n_rows-1,2));
}

 

 

 

 

 

./CppQTableViewExample9/qtmain.cpp

 

#include <QApplication>
#include "qtdialog.h"

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  QtDialog w;
  w.show();
  return a.exec();
}

 

 

 

 

 

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